Sorry if this has been asked before. Got this from another forum as a potential problem with the 450 smart cdis - some sort of limit of 2600 meters altitude due to fuel cooling/fuel boiling with less than a full tank. I didn't notice anything about this in our E320 owners manual - anything to be concerned about with the M-B diesels?

I understood the issue would be excessive fuel heating instead of power loss. The CDI high pressure pump creates a lot of heat and other models at least have a fuel cooler. Could it be that this is not present on the Smart?